Display apparatus

ABSTRACT

A display apparatus is provided that includes a substrate having a display area and a peripheral area located outside the display area. A first part of an edge of the display area has a round shape and the peripheral area includes a pad area. The display apparatus further includes a first wiring extending in a direction toward the first part from the pad area, and having a first discontinuous point at which the first wiring is physically discontinuous; and a first bridge wiring allowing the first wiring to be electrically continuous at the first discontinuous point.

CROSS-REFERENCE TO RELATED APPLICATION

This U.S. application is a continuation application of U.S. patentapplication Ser. No. 15/880,089, filed Jan. 25, 2018, which claims thebenefit of priority under 35 U.S.C. § 119 to Korean Patent ApplicationNo. 10-2017-0076813, filed on Jun. 16, 2017, in the Korean IntellectualProperty Office, the disclosures of which are incorporated by referencein their entireties herein.

BACKGROUND 1. Technical Field

The present disclosure relates to a display apparatus, and moreparticularly, to a display apparatus which may reduce generation ofdefects in pixels at an edge of a display area during a manufacturingprocess.

2. Discussion of Related Art

A display apparatus has a display area including several pixels. Whensome of the pixels located in the display area are defective, quality ofan image produced by the display apparatus may deteriorate. Accordingly,it is necessary to prevent generation of defective pixels during amanufacturing process or to reduce an incidence rate of defectivepixels.

However, it can be difficult to prevent defective pixels from beingformed at an edge of a display area during the manufacturing process.

SUMMARY

At least one embodiment of the inventive concept includes a displayapparatus which may reduce generation of defective pixels in an edge ofa display area during a manufacturing process.

According to an exemplary embodiment of the inventive concept, a displayapparatus includes a substrate having a display area and a peripheralarea disposed outside the display area. A first part of an edge of thedisplay area has a curved shape and the peripheral area includes a padarea. The display apparatus further includes a first wiring extending ina direction toward the first part such that a first one end of the firstwiring is located in the pad area and a first other end of the firstwiring is located in the peripheral area, a first additional wiringextending in a direction toward the display area such that a firstadditional one end of the first additional wiring is electricallyconnected to the first other end of the first wiring and a firstadditional other end of the first additional wiring is located in theperipheral area, and a first signal line extending in a direction towardan inside of the display area and having one end electrically connectedto the first additional other end.

The display apparatus may further include a first bridge wiringconnecting the first other end of the first wiring to the firstadditional one end of the first additional wiring.

The first wiring and the first additional wiring may include the samematerial, and the first bridge wiring may include the same material asthe first signal line and may be arranged on the same layer as the firstsignal line.

The first wiring and the first additional wiring may be arranged on thesame layer.

The display apparatus may further include a first additional bridgewiring located over the first bridge wiring and having both endsconnected to the first bridge wiring.

The display apparatus may further include a thin film transistor locatedin the display area and comprising a gate electrode, a source electrode,and a drain electrode, the source and drain electrodes being located onan interlayer insulating film covering the gate electrode, wherein thefirst wiring and the first additional wiring include the same materialas the gate electrode and are arranged on the same layer as the gateelectrode, and the first signal line may include the same material asthe source electrode and the drain electrode and may be arranged on thesame layer as the source electrode and the drain electrode.

The display apparatus may further include a first bridge wiringconnecting the first other end of the first wiring and the firstadditional one end of the first additional wiring, including the samematerial as the first signal line, and arranged on the same layer as thefirst signal line.

The display apparatus may further include a pixel electrode electricallyconnected to one of the source electrode and the drain electrode, and afirst additional bridge wiring having both ends connected to the firstbridge wiring, comprising the same material as the pixel electrode, andarranged on the same layer as the pixel electrode.

The display apparatus may further include a pixel electrode electricallyconnected to one of the source electrode and the drain electrode, and afirst additional bridge wiring connecting the first other end of thefirst wiring and the first additional one end of the first additionalwiring, including the same material as the pixel electrode, and arrangedon the same layer as the pixel electrode.

The first other end of the first wiring may be closer to the displayarea than the first additional one end of the first additional wiring.

The display area may include a first edge and a second edge facing eachother, and a third edge and a fourth edge facing each other and beingarranged between the first edge and the second edge, the first partconnecting the first edge and the fourth edge, and the pad area may beclose to the fourth edge among the first edge to the fourth edge.

The display apparatus may further include a second wiring extending in adirection toward the first part such that a second one end of the secondwiring is located in the pad area and a second other end of the secondwiring is located in the peripheral area, and arranged closer to thefirst edge than the first wiring, a second additional wiring extendingin a direction toward the display area such that a second additional oneend of the second additional wiring is electrically connected to thesecond other end of the second wiring and a second additional other endof the second additional wiring is located in the peripheral area, andarranged closer to the first edge than the first additional wiring, anda second signal line having one end electrically connected to the secondadditional other end and extending in a direction toward the inside ofthe display area.

A shortest distance from an imaginary straight line including the fourthedge to a second position at which the second other end of the secondwiring and the second additional one end of the second additional wiringare connected to each other may be greater than a shortest distance fromthe imaginary straight line to at a first position where the first otherend of the first wiring and the first additional one end of the firstadditional wiring are connected to each other.

The display apparatus may further include a first bridge wiringconnecting the first other end of the first wiring and the firstadditional one end of the first additional wiring, and a second bridgewiring connecting the second other end of the second wiring and thesecond additional one end of the second additional wiring.

The display apparatus may further include a first thin film transistorlocated in the display area and comprising a first gate electrode, afirst source electrode, and a first drain electrode, and a second thinfilm transistor located in the display area and comprising a second gateelectrode, a second source electrode, and a second drain electrode,wherein the first gate electrode and the second gate electrode arelocated on different layers, and the first source electrode, the firstdrain electrode, the second source electrode, and the second drainelectrode are located on an interlayer insulating film covering thefirst gate electrode and the second gate electrode, and wherein thefirst wiring and the first additional wiring comprise the same materialas the first gate electrode and are arranged on the same layer as thefirst gate electrode, and the second wiring and the second additionalwiring comprise the same material as the second gate electrode and arearranged on the same layer as the second gate electrode.

The display apparatus may further include a first thin film transistorlocated in the display area and comprising a first gate electrode, afirst source electrode, and a first drain electrode, and a second thinfilm transistor located in the display area and comprising a second gateelectrode, a second source electrode, and a second drain electrode,wherein the first gate electrode and the second gate electrode arelocated on different layers, and the first source electrode, the firstdrain electrode, the second source electrode, and the second drainelectrode are located on an interlayer insulating film covering thefirst gate electrode and the second gate electrode, and wherein thefirst wiring and the second additional wiring comprise the same materialas the first gate electrode and are arranged on the same layer as thefirst gate electrode, and the second wiring and the first additionalwiring comprise the same material as the second gate electrode and arearranged on the same layer as the second gate electrode.

The display apparatus may further include a first thin film transistorlocated in the display area and comprising a first gate electrode, afirst source electrode, and a first drain electrode, and a second thinfilm transistor located in the display area and comprising a second gateelectrode, a second source electrode, and a second drain electrode,wherein the first source electrode and the first drain electrode arelocated on a different layer from the second source electrode and thesecond drain electrode, and wherein the first signal line and the firstbridge wiring comprise the same material as the first source electrodeand the first drain electrode, and are arranged on the same layer as thefirst source electrode and the first drain electrode, and the secondsignal line and the second bridge wiring comprise the same material asthe second source electrode and the second drain electrode, and arearranged on the same layer as the second source electrode and the seconddrain electrode.

The display apparatus may further include a first thin film transistorlocated in the display area and comprising a first gate electrode, afirst source electrode, and a first drain electrode, a second thin filmtransistor located in the display area and comprising a second gateelectrode, a second source electrode, and a second drain electrode, afirst additional bridge wiring located over the first bridge wiring andhaving both ends connected to the first bridge wiring, and a secondadditional bridge wiring located over the second bridge wiring andhaving both ends connected to the second bridge wiring, wherein thefirst source electrode and the first drain electrode are located on adifferent layer from the second source electrode and the second drainelectrode, the first bridge wiring and the second bridge wiring comprisethe same material as the first source electrode and the first drainelectrode, and are arranged on the same layer as the first sourceelectrode and the first drain electrode, and the first additional bridgewiring and the second additional bridge wiring comprise the samematerial as the second source electrode and the second drain electrode,and are arranged on the same layer as the second source electrode andthe second drain electrode.

According to an exemplary embodiment of the inventive concept, a displayapparatus includes a substrate having a display area and a peripheralarea located outside the display area. A first part of an edge of thedisplay area has a curved shape and the peripheral area includes a padarea. The display apparatus further includes a first wiring extending ina direction toward the first part from the pad area, and having a firstdiscontinuous point at which the first wiring is physicallydiscontinuous, and a first bridge wiring allowing the first wiring to beelectrically continuous at the first discontinuous point.

The display apparatus may further include a second wiring extending in adirection toward the first part from the pad area and having a seconddiscontinuous point at which the second wiring is physicallydiscontinuous, and a second bridge wiring allowing the second wiring tobe electrically continuous at the second discontinuous point, whereinthe second bridge wiring is located farther from the pad area than thefirst bridge wiring, and the second bridge wiring is closer to an edgeof the substrate than the first bridge wiring.

According to an exemplary embodiment of the inventive concept, a displayapparatus includes a substrate having a display area and a peripheralarea disposed outside the display area. A first part of an edge of thedisplay area has a curved shape and the peripheral area includes a padarea. The display apparatus further includes a first wiring extending ina direction toward the first part such that a first one end of the firstwiring is located in the pad area and a first other end of the firstwiring is located in the peripheral area, a first additional wiringextending in a direction toward the display area such that a firstadditional one end of the first additional wiring is electricallyconnected to the first other end of the first wiring and a firstadditional other end of the first additional wiring is located in theperipheral area, and first bridge wiring connecting the first other endof the first wiring to the first additional one end of the firstadditional wiring.

The display apparatus may further include a first signal line extendingin a direction toward an inside of the display area and having one endelectrically connected to the first additional other end.

In an embodiment, the first bridge wiring is arranged on a same layer asthe first signal line, and the first wiring and the first additionalwiring are arranged on a same layer.

BRIEF DESCRIPTION OF THE DRAWINGS

The inventive concept will become apparent and more readily appreciatedfrom the following description of the embodiments, taken in conjunctionwith the accompanying drawings in which:

FIG. 1 is a conceptual view schematically illustrating one aspect of amanufacturing process of a display apparatus, according to anembodiment;

FIG. 2 is a conceptual view schematically illustrating a portion A ofFIG. 1;

FIG. 3 is a conceptual view schematically illustrating a portion B ofFIG. 2;

FIG. 4 is a cross-sectional view schematically illustrating portions ofFIG. 3;

FIG. 5 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 6 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 7 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 8 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 9 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 10 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 11 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 12 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 13 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 14 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 15 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 16 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 17 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 18 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept;

FIG. 19 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept; and

FIG. 20 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept.

DETAILED DESCRIPTION

As the disclosure allows for various changes and numerous embodiments,embodiments will be illustrated in the drawings and described in detailin the written description. However, this is not intended to limit thepresent disclosure to particular modes of practice, and it is to beappreciated that all changes, equivalents, and substitutes that do notdepart from the spirit and technical scope of the present disclosure areencompassed in the present disclosure.

Like reference numerals in the drawings denote like elements.

It will be understood that when a component, such as a layer, a film, aregion, or a plate, is referred to as being “on” another component, thecomponent can be directly on the other component or interveningcomponents may be present thereon.

In the following examples, the x-axis, the y-axis and the z-axis are notlimited to three axes of the rectangular coordinate system, and may beinterpreted in a broader sense. For example, the x-axis, the y-axis, andthe z-axis may be perpendicular to one another, or may representdifferent directions that are not perpendicular to one another.

FIG. 1 is a conceptual view schematically illustrating one aspect of amanufacturing process of a display apparatus according to an exemplaryembodiment of the inventive concept. FIG. 2 is a conceptual viewschematically illustrating a portion A of FIG. 1. FIG. 3 is a conceptualview schematically illustrating a portion B of FIG. 2. FIG. 4 is across-sectional view schematically illustrating portions of FIG. 3.

As illustrated in FIG. 1, the display apparatus according to the presentembodiment includes a display area DA in which a plurality of pixels arelocated and a peripheral area PA located outside the display area DA. Inother words, a substrate 100 has the display area DA and the peripheralarea PA. The peripheral area PA includes a pad area PADA that is an areawhere various electric elements or printed circuit boards areelectrically attached.

FIG. 1 may be interpreted to be a plan view illustrating a shape of asubstrate in a manufacturing process. In a final display apparatus or anelectronic apparatus such as a smartphone including the displayapparatus, the substrate 100 may be partially bent in order to reducethe area of the peripheral area PA recognized by a user. For example, asillustrated in FIG. 2, the peripheral area PA may include a bending areaBA, and the bending area BA may be located between the pad area PADA andthe display area DA. In this case, in order to allow a substrate 100 tobe bent in the bending area BA, at least a part of the pad area PADA islocated overlapping the display area DA. A bending direction is set suchthat the pad area PADA does not cover the display area DA but is locatedbehind the display area DA. Accordingly, the user may recognize that thedisplay area DA takes up most of the display apparatus.

The substrate 100 may include various materials having flexible orbendable characteristics, for example, a polymer resin such aspolyethersulphone (PES), polyacrylate, polyetherimide (PEI),polyethylene naphthalate (PEN), polyethylene terephthalate (PET),polyphenylene sulfide (PPS), polyallylate (PAR), polyimide (PI),polycarbonate (PC), or cellulose acetate propionate (CAP). The substrate100 may be variously modified, for example, may have a multilayerstructure of two layers each including the above polymer resin and onebarrier layer including an inorganic material such as silicon oxide,silicon nitride, silicon oxynitride, etc.

In an embodiment, the edge of the display area DA has a shape similar toa rectangle or a square as a whole. However, as illustrated in FIGS. 1and 2, a first part P1 at the edge of the display area DA has a curvedor round shape. As shown in FIG. 1, the display area DA includes a firstedge E1 and a second edge E2 facing each other, and a third edge E3 anda fourth edge E4 facing each other and located between the first edge E1and the second edge E2. The pad area PADA is adjacent the fourth edgeE4. The first part P1 having a round shape connects the first edge E1 tothe fourth edge E4. In addition to the first part P1, a second part P2at the edge of the display area DA may have a round shape. The secondpart P2 connects the second edge E2 to the fourth edge E4. Furthermore,the other portion at the edge of the display area DA may have a roundshape.

For reference, FIG. 3 is a conceptual view schematically illustrating aportion B of FIG. 2, showing a part of the first part P1. As illustratedin FIGS. 1 and 2, when observed by a user using the display apparatusaccording to the present embodiment or an electronic apparatus includingthe display apparatus in a general use environment, the first part P1 isrecognized to have a round shape, that is, a curved shape. However, inan environment in which wirings having a width of several micrometers orseveral tens of micrometers are observed by magnifying the first partP1, as illustrated in FIG. 3, the first part P1 appears to have multiplebent linear shapes. Even when the first part P1 appears to have multiplebent linear shapes as illustrated in FIG. 3 by magnifying the first partP1, since in the general use environment the first part P1 is recognizedto have a round shape, that is, a curved shape, in the followingdescription, the first part P1 is described to have a round shape. Aplurality of pixels PX1, PX1-1, PX1-2, PX2, and PX3 are located in thedisplay area DA along the first part P1 having a round shape. Forreference, in FIG. 3, only some of the pixels in the display area DA aredisplayed for convenience of explanation.

A variety of signals may be applied to the display area DA. For example,a data signal to adjust brightness of each pixel may be applied to thedisplay area DA. To this end, various wirings such as data wirings maybe located inside and outside of the display area DA. Such wirings aredescribed in the following description.

The display apparatus according to a present exemplary embodimentincludes a first wiring W1, a first additional wiring AW1, and a firstsignal line S1. The first wiring W1 extends in a direction toward thefirst part P1 such that a first one end thereof is located in the padarea PADA and a first other end thereof is located in the peripheralarea PA. Although FIG. 3 illustrates only a part of the first wiring W1,since the first one end of the first wiring W1 is located in the padarea PADA as illustrated in FIGS. 1 and 2, the first wiring W1 may be along wiring. In addition, since the first wiring W1 has a long shapeextending in the direction toward the first part P1 in the pad areaPADA, the first wiring W1 may have a multiple bent shapes as illustratedin FIGS. 1 and 2.

The first additional wiring AW1 extends toward the display area DA suchthat a first additional one end of the first additional wiring AW1 iselectrically connected to the first other end of the first wiring W1 anda first additional other end thereof is located in the peripheral areaPA. Since both of the first additional one end and the first additionalother end of the first additional wiring AW1 are located in theperipheral area PA, the first additional wiring AW1 is located in theperipheral area PA, not in the display area DA. Since the firstadditional wiring AW1 extends toward the display area DA, the firstadditional other end of the first additional wiring AW1 is locatedaround the display area DA. To electrically connect the first additionalone end of the first additional wiring AW1 to the first other end of thefirst wiring W1, the display apparatus may further include a firstbridge wiring BW1 contacting each of the first additional one end of thefirst additional wiring AW1 and the first other end of the first wiringW1.

The first signal line S1 is mostly located in the display area DA.However, since one end of the first signal line S1 is located in theperipheral area PA and electrically connected to the first additionalother end of the first additional wiring AW1, the first signal line S1is not located only in the display area DA. In other words, it may beunderstood that the one end of the first signal line S1 is electricallyconnected to the first additional other end of the first additionalwiring AW1 and the first signal line S1 extends into the inside of thedisplay area DA. The first signal line S1 may be, for example, a datawiring for transmitting a data signal to the pixels located in thedisplay area DA.

In the display apparatus according to the present embodiment configuredas discussed above, generation of defects in the pixels at the edge ofthe display area DA in the manufacturing process may be reduced. In themanufacturing process, not all of the first wiring W1, the firstadditional wiring AW1, and the first signal line S1 are formed at thesame time. For example, while the first wiring W1 and the firstadditional wiring AW1 are formed of the same material at the same time,the first signal line S1 and the first bridge wiring BW1 may be formedafter the first wiring W1 and the first additional wiring AW1 areformed. In other words, the first signal line S1 and the first bridgewiring BW1 may be located in a layer different from a layer where thefirst wiring W1 and the first additional wiring AW1 are formed.

The first wiring W1 and the first additional wiring AW1 are formed of,for example, metal such as molybdenum or aluminum, in a method such assputtering. For example, sputtering may include a process wherebyparticles are ejected from a solid target material due to bombardment ofthe target by energetic particles. When a first interlayer insulatingfilm 131 (see FIG. 4) is formed after the first wiring W1 and the firstadditional wiring AW1 are formed, a method such as a plasma enhancedchemical vapor deposition (PECVD) method may be used. For example, PECVDmay include a chemical vapor deposition process used to deposit thinfilms from a gas state to a solid state on a substrate. In this case,electric charges may be accumulated in the first wiring W1 and the firstadditional wiring AW1 that were previously formed. In particular, sinceplasma is used when an insulating layer is formed by the PECVD methodafter the first wiring W1 and the first additional wiring AW1 areformed, electric charges may be accumulated in the first wiring W1 andthe first additional wiring AW1 in such a process. Since the firstwiring W1 is relatively longer than the first additional wiring AW1between the first wiring W1 and the first additional wiring AW1, thetotal amount of electric charges accumulated in the first wiring W1 isgreater than the total amount of electric charges accumulated in thefirst additional wiring AW1.

Instead of forming the first additional wiring AW1, the first wiring W1may be formed relatively long such that the first other end of the firstwiring W1 is located around the display area DA, and that one end of thefirst signal line S1 is connected to the first other end of the firstwiring W1. In this case, before the first signal line S1 is formed, thefirst wiring W1 is formed such that the first one end of the firstwiring W1 is located in the pad area PADA and the first other endthereof is located around the display area DA to have a long shape.Accordingly, in the process of forming the insulating layer after thefirst wiring W1 is formed, a very large amount of electric charges isaccumulated in the first wiring W1.

A semiconductor layer that is a constituent element of a thin filmtransistor and an insulating layer covering the semiconductor layer areformed in the display area DA. In this state, such a long first wiringW1 is formed. Accordingly, in this case, a strong electromagnetic fieldmay be formed due to a large electric potential difference between thefirst other end of the first wiring W1 located around the display areaDA and the semiconductor layer that is to be a constituent element of athin film transistor in a pixel in the display area DA. This is possiblebecause a large amount of electric charges are accumulated in the firstwiring W1. Then, due to the strong electromagnetic field, a phenomenonsuch as insulation breakdown (dielectric breakdown) may occur in theinsulating layer covering the semiconductor layer. Even when a thin filmtransistor is completed later, the thin film transistor may not operateproperly. As a result, the pixel may become a defective pixel.

The display apparatus according to the present embodiment may prevent orreduce the occurrence of such a problem. In other words, the firstwiring W1 that is relatively longer between the first wiring W1 and thefirst additional wiring AW1 is located such that the first other end ofthe first wiring W1 is not located close to the display area DA, but islocated spaced apart by a certain distance from the display area DA.Accordingly, even when a large amount of electric charges areaccumulated in the first wiring W1 in the manufacturing process,insulation breakage may not occur between the first wiring W1 and theinsulating layer covering the semiconductor layer in the display areaDA. Accordingly, in the display apparatus according to the presentembodiment, the generation of a defective pixel in the manufacturingprocess may be prevented or reduced. Although the first additional otherend of the first additional wiring AW1 is located around the displayarea DA, the first additional wiring AW1 is shorter than the firstwiring W1 and thus the amount of electric charge accumulated in thefirst additional wiring AW1 in the manufacturing process is not large.Accordingly, the insulation breakage may not occur between theinsulating layer covering the semiconductor layer in the display area DAand the first additional other end of the first additional wiring AW1.

The first wiring W1 and the first additional wiring AW1 are electricallyconnected to each other by forming the first bridge wiring BW1 after thefirst wiring W1 and the first additional wiring AW1 are formed. In thiscase, however, when the first bridge wiring BW1 is formed, the firstsignal line S1 electrically connected to the first additional wiring AW1is formed of the same material at the same time, and thus a large amountof electric charges accumulated in the first wiring W1 may be moved notonly toward the first additional wiring AW1, but also toward the firstsignal line S1, through the first bridge wiring BW1. The first signalline S1 extends in a y-axis direction to pass through the pixels PX1,PX1-1, PX1-2, and PX1-3 in the display area DA. For example, the firstsignal line S1 has a long shape extending from the vicinity of thefourth edge E4 toward the vicinity of the third edge E3. Accordingly,the electric charges accumulated in the first wiring W1 spread along thefirst additional wiring AW1 and the first signal line S1, not forming alocally strong electromagnetic field at a particular location.Accordingly, insulation breakage in the insulating layer may not occur.For reference, the first signal line S1 may include metal such astitanium or aluminum or may have a single layer or a multilayer. Forexample, the first signal line S1 may have a trilayer structure oftitanium/aluminum/titanium.

In the above described display apparatus, the first other end of thefirst wiring W1 may be closer to the display area DA in an x-axisdirection than the first additional one end of the first additionalwiring AW1. Although only the first wiring W1 is described in the abovedescription, as described below, a second wiring W2 and a third wiringW3 are present, and the first wiring W1 to the third wiring W3 have ashape extending from the pad area PADA in a direction toward the displayarea DA. In this state, the first wiring W1 to the third wiring W3 havea shape of gradually spreading from the pad area PADA in the directiontoward the display area DA. Considering the layout of the first wiringW1 to the third wiring W3 having a spread-out shape and the firstadditional wiring AW1 to the third additional wiring AW3 connectedthereto, the first other end of the first wiring W1 may be closer to thedisplay area DA in the x-axis direction than the first additional oneend of the first additional wiring AW1. That is, the first additionalone end of the first additional wiring AW1 may be farther away from thedisplay area DA in the x-axis direction than the first other end of thefirst wiring W1.

The first wiring W1 connected to the first signal line S1 may transmitelectrical signals such as data signals to the pixels PX1, PX1-1, PX1-2,and PX1-3 of a first row. The electrical signals such as data signalsshould be transmitted to the pixels of a row other than the first row.To this end, other wirings may be arranged in the peripheral area PA.For example, as illustrated in FIG. 3, the second wiring W2 may bearranged in the peripheral area PA. In FIG. 3, the second wiring W2extends in the direction toward the first part P1 such that a second oneend of the second wiring W2 is located in the pad area PADA and a secondother end of the second wiring W2 is located in the peripheral area PA.The second wiring W2 is illustrated to be arranged closer to the firstedge E1 (see FIG. 1) than the first wiring W1. The second wiring W2transmits an electrical signal to the pixel PX2. To this end, the secondwiring W2 is electrically connected to a second signal line S2 via asecond bridge wiring BW2 and a second additional wiring AW2.

The second additional wiring AW2 extends toward the display area DA suchthat a second additional one end of the second additional wiring AW2 iselectrically connected to the second other end of the second wiring W2via the second bridge wiring BW2, and a second additional other end ofthe second additional wiring AW2 is located in the peripheral area PA.The second additional wiring AW2 as well is arranged closer to the firstedge E1 than the first additional wiring AW1. The second additionalother end of the second additional wiring AW2 is electrically connectedto one end of the second signal line S2, and the second signal line S2extends in the y-axis direction toward the inside of the display area DAand transmits an electrical signal to the pixel PX2.

The above description about the positional relationship among the firstwiring W1, the first bridge wiring BW1, the first additional wiring AW1,and the first signal line S1 may be applied, without change, to thepositional relationship among the second wiring W2, the second bridgewiring BW2, the second additional wiring AW2, and the second signal lineS2. In this state, a second position where the second other end of thesecond wiring W2 and the second additional one end of the secondadditional wiring AW2 are connected to each other, that is, a positionwhere the second bridge wiring BW2 is located, may be located fartheraway from the pad area PADA than a first position where the first otherend of the first wiring W1 and the first additional one end of the firstadditional wiring AW1 are connected to each other, that is, a positionwhere the first bridge wiring BW1 is located. In FIG. 3, the position ofthe second bridge wiring BW2 is illustrated to be located farther awayfrom the pad area PADA in a +y direction than the position of the firstbridge wiring BW1. Assuming an imaginary straight line including thefourth edge E4 (see FIG. 2), the shortest distance of the second bridgewiring BW2 from the imaginary straight line is greater than the shortestdistance of the first bridge wiring BW1 from the imaginary straightline.

As illustrated in FIG. 3, the third wiring W3 is arranged closer to thefirst edge E1 (see FIG. 1) than the first wiring W1 and the secondwiring W2. The third wiring W3 is electrically connected to a thirdsignal line S3 via a third bridge wiring BW3 and the third additionalwiring AW3 and applies an electrical signal to the pixel PX3. In thiscase, the third bridge wiring BW3 is located farther from the pad areaPADA than the position where the second bridge wiring BW2 is located.This is because the first part P1 of the edge of the display area DA hasa round shape and thus there is a need to adjust the positions of thefirst bridge wiring BW1 relative to the third bridge wiring BW3according to the shape of the first part P1. In an embodiment, thesecond bridge wiring BW2 is located between the first and third bridgewirings BW1 and BW3.

As the length of each of the first additional wiring AW1 to the thirdadditional wiring AW3 increases, the amount of electric chargesaccumulated in the wirings increases as well. Accordingly, a possibilityof occurrence of defects in the pixels of an adjacent display area mayincrease. Thus, it is necessary to prevent the length of each of thefirst additional wiring AW1 to the third additional wiring AW3 frombeing increased.

To this end, the length of each of the first additional wiring AW1 tothe third additional wiring AW3 is prevented from being increased byadjusting the positions of the first bridge wiring BW1 to the thirdbridge wiring BW3 according to the shape of the first part P1 having around shape. The adjusted positions of the first bridge wiring BW1 tothe third bridge wiring BW3 are the same as those described above. Inother words, the third bridge wiring BW3 may be located farther from thepad area PADA than the position where the second bridge wiring BW2 islocated, and the second bridge wiring BW2 may be located farther fromthe pad area PADA than the position where the first bridge wiring BW1 islocated.

As described above, since the first wiring W1 and the first additionalwiring AW1 are formed of the same material at the same time in themanufacturing process, the first wiring W1 and the first additionalwiring AW1 may include the same material. The first wiring W1 and thefirst additional wiring AW1 may be located on the same layer. Asdescribed above, since the first signal line S1 and the first bridgewiring BW1 are formed of the same material at the same time, the firstsignal line S1 and the first bridge wiring BW1 may include the samematerial. The first signal line S1 and the first bridge wiring BW1 maybe located on the same layer. If necessary, a first additional bridgewiring located above the first bridge wiring BW1 and having both endsconnected to the first bridge wiring BW1 may be further provided. Inthis case, since the first bridge wiring BW1 and the first additionalbridge wiring are parallelly connected to each other, an effect ofreducing total resistance may be obtained considering the first bridgewiring BW1 and the first additional bridge wiring.

In the following description, the present embodiment is described indetail with reference to FIG. 4 that is a cross-sectional viewschematically illustrating portions of FIG. 3. FIG. 4 is across-sectional view illustrating portions spaced apart from one anotherin FIG. 3, which does not illustrate constituent elements adjacent toone another. For example, FIG. 4 illustrates a pixel PX1 and a pixelPX2. As illustrated in FIG. 3, the pixel PX1 and the pixel PX2 are notthe pixels located adjacent each other. Furthermore, FIG. 4 is across-sectional view illustrating portions spaced apart from one anotherin FIG. 3, in which cross-sections at the portions spaced apart from oneanother are not taken in the same direction. For example, in the case ofa cross-section illustrating the first signal line S1 and the firstadditional wiring AW1 altogether, the cross-section is taken in adirection (y-axis direction) in which the first signal line S1 extends,and in the case of a cross-section illustrating the first additionalwiring AW1, the first wiring W1, and the first bridge wiring BW1altogether, the cross-section is taken in a direction (x-axis direction)in which the first bridge wiring BW1 extends.

As illustrated in FIG. 4, in the display area DA of the substrate 100,in addition to first and second display elements 310 and 320, a firstthin film transistor 210 is disposed electrically connected to the firstdisplay element 310 and a second thin film transistor 220 is disposedelectrically connected to the second display element 320. FIG. 4illustrates that organic light-emitting elements such as the first andsecond display elements 310 and 320 are located in the display area DA.The electrical connection of the organic light-emitting elements to thefirst and second thin film transistors 210 and 220 may be understood tobe a first pixel electrode 311 electrically connected to the first thinfilm transistor 210 and a second pixel electrode 321 electricallyconnected to the second thin film transistor 220.

For reference, in FIG. 4, the first thin film transistor 210 is locatedat the pixel PX1, the second thin film transistor 220 is located at thepixel PX2, the first display element 310 is electrically connected tothe first thin film transistor 210, and the second display element 320is electrically connected to the second thin film transistor 220. In thefollowing description, for convenience of explanation, the first thinfilm transistor 210 and the first display element 310 are described, andthe description thereof may be applied to the second thin filmtransistor 220 and the second display element 320. In other words,descriptions of a second semiconductor layer 221, a second gateelectrode 223, a second source electrode 225 a, and a second drainelectrode 225 b of the second thin film transistor 220, and descriptionsof the pixel electrode 321, an opposite electrode 325, and anintermediate layer 323 of the second display element 320, are omitted.For reference, the opposite electrode 325 of the second display element320 may be integrally formed with an opposite electrode 315 of the firstdisplay element 310.

The first thin film transistor 210 includes a first semiconductor layer211. The first semiconductor layer 211 may include amorphous silicon,polycrystalline silicon, or an organic semiconductor material. The firstthin film transistor 210 further includes a first gate electrode 213, afirst source electrode 215 a, and a first drain electrode 215 b. Tosecure insulation between the first semiconductor layer 211 and thefirst gate electrode 213, a first gate insulating film 121 including aninorganic material such as silicon oxide, silicon nitride, and/orsilicon oxynitride may be interposed between the first semiconductorlayer 211 and the first gate electrode 213. The first interlayerinsulating film 131 may include an inorganic material such as siliconoxide, silicon nitride, and/or silicon oxynitride. In an embodiment, thefirst interlayer insulating film 131 is arranged over the first gateelectrode 213, and the first source electrode 215 a and the first drainelectrode 215 b is arranged on the first interlayer insulating film 131.The insulating film including the inorganic material (e.g., the firstgate insulating film 121) may be formed by a chemical vapor deposition(CVD) method or an atomic layer deposition (ALD) method. For example,the CVD method may include exposing a substrate to one or more volatileprecursor, which react and/or decompose on the substrate surface toproduce a desired deposit. The ALD method may include a thin filmdeposition technique that is based on sequential use of a gas phasechemical process.

A buffer layer 110 may include an inorganic material such as siliconoxide, silicon nitride, and/or silicon oxynitride. The buffer layer 110may be interposed between the first thin film transistor 210 and thesubstrate 100 having the above structure. The buffer layer 110 mayimprove smoothness of an upper surface of the substrate 100, or preventor reduce intrusion of impurities from the substrate 100 into the firstsemiconductor layer 211 of the first thin film transistor 210.

A planarization layer 140 may be arranged on the first thin filmtransistor 210. For example, as illustrated in FIG. 4, when an organiclight-emitting element is arranged over the first thin film transistor210, the planarization layer 140 may roughly planarize an upper surfaceof a protection film covering the first thin film transistor 210. Theplanarization layer 140 may be formed of an organic material, forexample, acryl, benzocyclobutene (BCB), or hexamethyldisiloxane (HMDSO).Although the planarization layer 140 is illustrated to be a single layerin FIG. 4, in an alternate embodiment the planarization layer 140 is amultilayer.

In an embodiment of the display area DA of the substrate 100, the firstdisplay element 310 is located on the planarization layer 140. The firstdisplay element 310 may be, for example, an organic light-emittingelement including the pixel electrode 311, the opposite electrode 315,and an intermediate layer 313 interposed therebetween and having alight-emitting layer. In an embodiment, the pixel electrode 311 iselectrically connected to the first thin film transistor 210 bycontacting any one of the first source electrode 215 a and the firstdrain electrode 215 b via an opening portion formed in the planarizationlayer 140. For example, while FIG. 4 shows the pixel electrode 311 beingelectrically connected to the first drain electrode 215 b via theopening, in an alternate embodiment, the pixel electrode 311 is insteadelectrically connected to the first source electrode 215 a through theopening.

A pixel defining layer 150 may be arranged over the planarization layer140. The pixel defining layer 150 has an opening corresponding to eachof sub-pixels, that is, an opening to have at least a center portion ofthe pixel electrode 311 exposed, thereby defining a pixel. Furthermore,as illustrated in FIG. 4, the pixel defining layer 150 preventsgeneration of an arc at an edge of the pixel electrode 311 by increasinga distance between the edge of the pixel electrode 311 and the oppositeelectrode 315 over the pixel electrode 311. The pixel defining layer 150may be formed of, for example, an organic material such as polyimide orHMDSO.

The intermediate layer 313 of the organic light-emitting element mayinclude a low molecular or polymer material. When the intermediate layer313 includes a low molecular material, the intermediate layer 313 mayhave a structure in which a hole injection layer (HIL), a hole transportlayer (HTL), an emission layer (EML), an electron transport layer (ETL),and an electron injection layer (EIL) are stacked in a single orcomposite structure, and may be formed by a vacuum deposition method.When the intermediate layer 313 includes a polymer material, theintermediate layer 313 may have a structure including the HTL and theEML. In this state, the HTL may include PEDOT, and the EML may include apolymer material such as a poly-phenylenevinylene (PPV) base and apolyfluorene base. In an embodiment, PEDOT ispoly(3,4-ethylenedioxythiophene). The intermediate layer 313 may beformed by a screen printing method, an inkjet printing method, or alaser induced thermal imaging (LITI) method. The intermediate layer 313is not necessarily limited thereto and may have various structures. Theintermediate layer 313 may include a layer that is integrally arrangedacross the pixel electrodes 311 and 321, or may include a layerpatterned corresponding to each of the pixel electrodes 311 and 321.

The opposite electrode 315 may be arranged over the display area DA tocover the display area DA. In an embodiment, the opposite electrode 315is integrally formed with respect to a plurality of organiclight-emitting elements and corresponds to the pixel electrodes 311 and321.

Since the organic light-emitting element may be damaged by externalmoisture or oxygen, in an exemplary embodiment, an encapsulation layer(not shown) is provided to protect the organic light-emitting element bycovering the organic light-emitting element. The encapsulation layercovers the display area DA and may extend to at least a part of theperipheral area PA. The encapsulation layer may include a firstinorganic encapsulation layer, an organic encapsulation layer, and asecond inorganic encapsulation layer.

As described above, since the first wiring W1 and the first additionalwiring AW1 are formed of the same material at the same time in themanufacturing process, the first wiring W1 and the first additionalwiring AW1 may include the same material. In an exemplary embodiment,when the first gate electrode 213 is formed, the first wiring W1 and thefirst additional wiring AW1 are simultaneously formed of the samematerial on the first gate insulating film 121. Accordingly, the firstwiring W1 and the first additional wiring AW1 include the same materialas the first gate electrode 213 and are arranged on the same layer. Asdescribed above, the first signal line S1 and the first bridge wiringBW1 are formed of the same material at the same time. In an embodiment,when the first source electrode 215 a and the first drain electrode 215b are formed, the first signal line S1 and the first bridge wiring BW1are simultaneously formed of the same material on the first interlayerinsulating film 131.

Accordingly, the first signal line S1 and the first bridge wiring BW1include the same material as the first source electrode 215 a and thefirst drain electrode 215 b, and are arranged on the same layer.

Considering the manufacturing process, after the first gate electrode213, the first wiring W1, and the first additional wiring AW1 areformed, the first interlayer insulating film 131 covering them isformed. Even when a large amount of electric charges are accumulated inthe first wiring W1 in the process of forming other insulating layersafter the first wiring W1 is formed, since the first one end of thefirst wiring W1 is located in the pad area PADA and the first other endthereof is located spaced apart by a certain distance from the displayarea DA, the generation of the above-described defect in the displayarea DA by a large amount of electric charges accumulated in the firstwiring W1 may be prevented. Although the first additional one end of thefirst additional wiring AW1 is located close to the first other end ofthe first wiring W1 and the first additional other end thereof islocated close to the display area DA, since the amount of accumulatedelectric charges in the first additional wiring AW1 is not large due tothe short length of the first additional wiring AW1, no defect isgenerated in the display area DA due to the accumulated electriccharges.

In an embodiment, a plurality of contact holes are then formed in thefirst interlayer insulating film 131, and the first source electrode 215a, the first drain electrode 215 b, the first signal line S1, and thefirst bridge wiring BW1 are simultaneously formed. Accordingly, thefirst signal line S1 contacts the first additional other end of thefirst additional wiring AW1 via one of the contact holes, and the firstbridge wiring BW1 contacts each of the first additional one end of thefirst additional wiring AW1 and the first other end of the first wiringW1 via the one or more of the contact holes. As such, since the firstsignal line S1 and the first bridge wiring BW1 are simultaneouslyformed, the electric charges accumulated in the first wiring W1instantly spread along the first additional wiring AW1 and the firstsignal line S1, Accordingly, no locally strong electromagnetic field isformed and thus a defect is not generated in the display area DA.

FIG. 5 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept. Different from the display apparatus described inFIG. 4, the display apparatus of FIG. 5 further includes a firstadditional bridge wiring ABW1.

In the manufacturing process, after the planarization layer 140 coveringthe first source electrode 215 a, the first drain electrode 215 b, thefirst signal line S1, and the first bridge wiring BW1 is formed, andcontact holes to connect the pixel electrodes 311 and 321 respectivelyto the first thin film transistor 210 and the second thin filmtransistor 220 are formed in the planarization layer 140, the pixelelectrodes 311 and 321 are formed on the planarization layer 140. Whenthe contact holes are formed, contact holes to expose the first bridgewiring BW1 are simultaneously formed, and when the pixel electrodes 311and 321 are formed, the first additional bridge wiring ABW1 having bothends connected to the first bridge wiring BW1 via the contact holes maybe formed of the same material at the same time. In this case, since thefirst bridge wiring BW1 and the first additional bridge wiring ABW1 areparallelly connected to each other, considering the first bridge wiringBW1 and the first additional bridge wiring ABW1, total resistance may bereduced.

However, the present disclosure is not limited thereto. For example, thecross-sectional view of FIG. 6 schematically illustrates portions of adisplay apparatus according to another exemplary embodiment where onlythe first additional bridge wiring ABW1 is present without the firstbridge wiring BW1. In other words, since the first additional bridgewiring ABW1 contacts the first other end of the first wiring W1 and thefirst additional one end of the first additional wiring AW1, the firstwiring W1 and the first additional wiring AW1 become electricallyconnected to each other. The first additional bridge wiring ABW1 may beformed of the same material at the same time when the pixel electrodes311 and 321 are formed.

In the display apparatus according to the present embodiment, since thefirst one end of the first wiring W1 in which a large amount of electriccharges are accumulated is located in the pad area PADA, and the firstother end thereof is located spaced apart by a certain distance from thepad area PADA, the generation of a defect in the display area DA by thelarge amount of electric charges accumulated in the first wiring W1 maybe prevented. In addition, the first wiring W1 in which a large amountof electric charges are accumulated is electrically connected to thefirst additional wiring AW1 and the first signal line S1 by the firstadditional bridge wiring ABW1 after the thin film transistors 210 and220 are completely formed in the display area DA. Accordingly, thegeneration of a defect in the thin film transistors 210 and 220 in themanufacturing process may be effectively prevented or reduced.

The cross-sectional view of FIG. 7 schematically illustrates portions ofa display apparatus according to an exemplary embodiment of theinventive concept where the first additional bridge wiring ABW1 isindirectly connected to the first other end of the first wiring W1 andthe first additional one end of the first additional wiring AW1. Inother words, connection layers BW1′ that include the same material asthe first source electrode 215 a and the first drain electrode 215 b,are located on the same layer, and are spaced apart from each other. Oneof the connection layers BW1′ is interposed between the first additionalwiring AW1 and the first additional bridge wiring ABW1, and the otherone of the connection layers BW1′ is interposed between the first wiringW1 and the first additional bridge wiring ABW1. Thus, the firstadditional bridge wiring ABW1 may be electrically connected to the firstother end of the first wiring W1 and the first additional one end of thefirst additional wiring AW1. The connection layers BW1′ that are spacedapart from each other may be formed at the same time when the firstsource electrode 215 a and the first drain electrode 215 b are formed.

FIG. 8 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept. Different from the display apparatus of FIG. 4, thedisplay apparatus of FIG. 8 further includes a second gate insulatingfilm 122 covering the first gate electrode 213 of the first thin filmtransistor 210, in addition to the first gate insulating film 121, andthe second gate electrode 223 of the second thin film transistor 220 islocated on the second gate insulating film 122. In other words, thefirst gate electrode 213 and the second gate electrode 223 are locatedat different layers. The first source electrode 215 a, the first drainelectrode 215 b, the second source electrode 225 a, and the second drainelectrode 225 b are located on the first interlayer insulating film 131covering the first gate electrode 213 and the second gate electrode 223.

The second gate insulating film 122 extends toward the peripheral areaPA and covers the first wiring W1 and the first additional wiring AW1.Even in this state, the first signal line S1 contacts the firstadditional wiring AW1 via a contact hole that penetrates through thesecond gate insulating film 122 and the first interlayer insulating film131, and the first bridge wiring BW1 also contacts the first additionalwiring AW1 and the first wiring W1 via a contact hole that penetratesthrough the second gate insulating film 122 and the first interlayerinsulating film 131.

In the case of the display apparatus according to the presentembodiment, the locations of the second wiring W2 and the secondadditional wiring AW2 may be different from those of the first wiring W1and the first additional wiring AW1. In other words, while the firstwiring W1 and the first additional wiring AW1 are located on the firstgate insulating film 121 like the first gate electrode 213, the secondwiring W2 and the second additional wiring AW2 may be located on thesecond gate insulating film 122 like the second gate electrode 223. Inthis case, the first wiring W1 and the first additional wiring AW1include the same material as the first gate electrode 213, and thesecond wiring W2 and the second additional wiring AW2 include the samematerial as the second gate electrode 223. In the manufacturing process,the first wiring W1 and the first additional wiring AW1 may besimultaneously formed with the first gate electrode 213, and the secondwiring W2 and the second additional wiring AW2 may be simultaneouslyformed with the second gate electrode 223.

As the resolution of a display apparatus increases, an interval betweenthe first wiring W1 and the second wiring W2 decreases as well. If thefirst wiring W1 and the second wiring W2 are located on the same layer,to prevent them from being electrically connected to each other, thewidth of each of the first wiring W1 and the second wiring W2 decreases,which may result in a resistance increase in the first wiring W1 and thesecond wiring W2. However, in the case of the display apparatusaccording to the present embodiment, since the first wiring W1 and thesecond wiring W2 are located on different layers, even when each of thefirst wiring W1 and the second wiring W2 has a sufficient width, thefirst wiring W1 and the second wiring W2 are not electrically connectedto each other. This is applied to the first additional wiring AW1 andthe second additional wiring AW2.

Although FIG. 8 illustrates that the first wiring W1 and the firstadditional wiring AW1 which are electrically connected to the pixel PX1are located on the same layer as the first gate electrode 213, and thatthe second wiring W2 and the second additional wiring AW2 which areelectrically connected to the pixel PX2 are located on the same layer asthe second gate electrode 223, the present disclosure is not limitedthereto. For example, unlike the illustration in FIG. 8, the firstwiring W1 and the first additional wiring AW1 which are electricallyconnected to the pixel PX1 may be located on the same layer as thesecond gate electrode 223, and the second wiring W2 and the secondadditional wiring AW2 which are electrically connected to the pixel PX2may be located on the same layer as the first gate electrode 213.

However, the present disclosure is not limited thereto. For example, thecross-sectional view of FIG. 9 schematically illustrates portions of adisplay apparatus according to an exemplary embodiment where the firstwiring W1 and the second additional wiring AW2 are located on the samelayer as the first gate electrode 213, and the second wiring W2 and thefirst additional wiring AW1 are located on the same layer as the secondgate electrode 223. In this case, the first wiring W1 and the secondadditional wiring AW2 may include the same material as the first gateelectrode 213, and the second wiring W2 and the first additional wiringAW1 may include the same material as the second gate electrode 223.

The cross-sectional view of FIG. 10 illustrates portions of a displayapparatus according to another embodiment where the second wiring W2 andthe first additional wiring AW1 are located on the same layer as thefirst gate electrode 213, and the first wiring W1 and the secondadditional wiring AW2 are located on the same layer as the second gateelectrode 223. In this case, the second wiring W2 and the firstadditional wiring AW1 may include the same material as the first gateelectrode 213, and the first wiring W1 and the second additional wiringAW2 may include the same material as the second gate electrode 223.

Although FIGS. 8 to 10 illustrate that the first thin film transistor210 is located at the pixel PX1 and the second thin film transistor 220is located at the pixel PX2, the present disclosure is not limitedthereto. As illustrated in FIGS. 11 to 13 that are cross-sectional viewsschematically illustrating portions of each of display apparatusesaccording to other embodiments, the second thin film transistor 220 aswell as the first thin film transistor 210 may belong to the pixel PX1.In other words, in the first thin film transistor 210 and the secondthin film transistor 220 which belong to one pixel, that is, the pixelPX1, the first gate electrode 213 of the first thin film transistor 210and the second gate electrode 223 of the second thin film transistor 220may be located on different layers. The pixel PX2 may also have a thinfilm transistor having the same structure as the first thin filmtransistor 210 and the second thin film transistor 220 which belong tothe pixel PX1. The descriptions about the first wiring W1, the secondwiring W2, the first additional wiring AW1, the second additional wiringAW2, the first signal line S1, and the second signal line S2 in theembodiments described with reference to FIGS. 8 to 10 may be applied tothe display apparatuses illustrated in FIGS. 11 to 13.

FIG. 14 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept. Different from the display apparatus of FIG. 4, thedisplay apparatus of FIG. 14 further includes a second interlayerinsulating film 132 covering the first source electrode 215 a and thefirst drain electrode 215 b of the first thin film transistor 210, inaddition to the first interlayer insulating film 131, and the secondsource electrode 225 a and the second drain electrode 225 b of thesecond thin film transistor 220 is located on the second interlayerinsulating film 132. In other words, the first source electrode 215 aand the first drain electrode 215 b are located on a different layerfrom the second source electrode 225 a and the second drain electrode225 b.

The second interlayer insulating film 132 extends toward the peripheralarea PA and covers the first signal line S1 and the first bridge wiringBW1. However, the second signal line S2 and the second bridge wiring BW2are located on the second interlayer insulating film 132. Even in thisstate, the second signal line S2 contacts the second additional wiringAW2 via a contact hole that penetrates through the first interlayerinsulating film 131 and the second interlayer insulating film 132, andthe second bridge wiring BW2 also contacts the second additional wiringAW2 and the second wiring W2 via contact holes that penetrate throughthe first interlayer insulating film 131 and the second interlayerinsulating film 132.

Although FIG. 14 illustrates that the first thin film transistor 210 islocated at the pixel PX1 and that the second thin film transistor 220 islocated at the pixel PX2, the present disclosure is not limited thereto.For example, the cross-sectional view of FIG. 15 schematicallyillustrates portions of a display apparatus according to anotherembodiment where the second thin film transistor 220 as well as thefirst thin film transistor 210 belong to the pixel PX1. In other words,in the first thin film transistor 210 and the second thin filmtransistor 220 which belong to one pixel, that is, the pixel PX1, thefirst source electrode 215 a and the first drain electrode 215 b of thefirst thin film transistor 210 are located on a different layer from thesecond source electrode 225 a and the second drain electrode 225 b ofthe second thin film transistor 220. To this end, the display apparatusaccording to the present embodiment further includes the secondinterlayer insulating film 132 covering the first source electrode 215 aand the first drain electrode 215 b of the first thin film transistor210, and the second source electrode 225 a and the second drainelectrode 225 b of the second thin film transistor 220 are located onthe second interlayer insulating film 132. The pixel PX2 may alsoinclude thin film transistors having the same structure as the firstthin film transistor 210 and the second thin film transistor 220 whichbelong to the pixel PX1.

The second interlayer insulating film 132 extends toward the peripheralarea PA, and covers the first signal line S1 and the first bridge wiringBW1. However, the second signal line S2 and the second bridge wiring BW2are located on the second interlayer insulating film 132. Even in thisstate, the second signal line S2 contacts the second additional wiringAW2 via a contact hole that penetrates through the first interlayerinsulating film 131 and the second interlayer insulating film 132, andthe second bridge wiring BW2 also contacts the second additional wiringAW2 and the second wiring W2 via contact holes that penetrate throughthe first interlayer insulating film 131 and the second interlayerinsulating film 132.

The cross-sectional view of FIG. 16 schematically illustrates portionsof a display apparatus according to another embodiment where any one ofthe first source electrode 215 a and the first drain electrode 215 b ofthe first thin film transistor 210 is electrically connected to thepixel electrode 311, an intermediate conductive layer 311 a isinterposed between any one of the first source electrode 215 a and thefirst drain electrode 215 b and the pixel electrode 311. In other words,the intermediate conductive layer 311 a may contact any one of the firstsource electrode 215 a and the first drain electrode 215 b, and thepixel electrode 311 may contact the intermediate conductive layer 311 a.The intermediate conductive layer 311 a may include the same material asthe second source electrode 225 a and the second drain electrode 225 bof the second thin film transistor 220, and may be located on the samelayer as the second source electrode 225 a and the second drainelectrode 225 b of the second thin film transistor 220. In other words,the intermediate conductive layer 311 a may be simultaneously formedwhen the second source electrode 225 a and the second drain electrode225 b are formed.

In the display apparatus according to the embodiment described abovewith reference to FIG. 15, the first signal line S1 and the first bridgewiring BW1 include the same material as the first source electrode 215 aand the first drain electrode 215 b of the first thin film transistor210, and are located on the first interlayer insulating film 131.Further, the second signal line S2 and the second bridge wiring BW2include the same material as the second source electrode 225 a and thesecond drain electrode 225 b of the second thin film transistor 220, andare located on the second interlayer insulating film 132. However, thepresent disclosure is not limited thereto.

For example, the cross-sectional view of FIG. 17 schematicallyillustrates portions of a display apparatus according to anotherembodiment where the first source electrode 215 a and the first drainelectrode 215 b of the first thin film transistor 210 are located on adifferent layer from the second source electrode 225 a and the seconddrain electrode 225 b of the second thin film transistor 220, and thesecond signal line S2 and the second bridge wiring BW2 are located onthe same layer as the first signal line S1 and the first bridge wiringBW1. In other words, the first signal line S1, the first bridge wiringBW1, the second signal line S2, and the second bridge wiring BW2 may beformed of the same material at the same time when the first sourceelectrode 215 a and the first drain electrode 215 b of the first thinfilm transistor 210 are formed.

Unlike the illustration in FIG. 15, in the cross-sectional view of FIG.18 schematically illustrates portions of a display apparatus where thesecond interlayer insulating film 132 extends toward the peripheral areaPA, and covers the second signal line S2 and the second bridge wiringBW2 located on the first interlayer insulating film 131. The firstsignal line S1 and the first bridge wiring BW1 may be located on thesecond interlayer insulating film 132. Even in this state, the firstsignal line S1 contacts the first additional wiring AW1 via a contacthole that penetrates through the first interlayer insulating film 131and the second interlayer insulating film 132, and the first bridgewiring BW1 also contacts the first additional wiring AW1 and the firstwiring W1 via contact holes that penetrate through the first interlayerinsulating film 131 and the second interlayer insulating film 132.

FIG. 19 is a cross-sectional view schematically illustrating portions ofa display apparatus according to an exemplary embodiment of theinventive concept. Different from the display apparatus of FIG. 14, thedisplay apparatus of FIG. 19 further includes the first additionalbridge wiring ABW1 and a second additional bridge wiring ABW2. The firstadditional bridge wiring ABW1 is located over the first bridge wiringBW1, and has both ends connected to the first bridge wiring BW1. Thesecond additional bridge wiring ABW2 is located over the second bridgewiring BW2, and has both ends connected to the second bridge wiring BW2.

In the manufacturing process, the planarization layer 140 covering thefirst source electrode 215 a, the first drain electrode 215 b, thesecond source electrode 225 a, the second drain electrode 225 b, thefirst signal line S1, the first bridge wiring BW1, the second signalline S2, and the second bridge wiring BW2 is formed, contact holes toconnect the pixel electrodes 311 and 321 to the first thin filmtransistor 210 and the second thin film transistor 220 are formed in theplanarization layer 140, and the pixel electrodes 311 and 321 are formedon the planarization layer 140. In this state, when the contact holesare formed, contact holes for exposing the first bridge wiring BW1 andcontact holes for exposing the second bridge wiring BW2 aresimultaneously formed. After that, when the pixel electrodes 311 and 321are formed, the first additional bridge wiring ABW1 having both endsconnected to the first bridge wiring BW1 via contact holes, and thesecond additional bridge wiring ABW2 having both ends connected to thesecond bridge wiring BW2 via contact holes, may be formed of the samematerial at the same time. In this case, since the first bridge wiringBW1 and the first additional bridge wiring ABW1 are parallelly connectedto each other and the second bridge wiring BW2 and the second additionalbridge wiring ABW2 are parallelly connected to each other, consideringthe first bridge wiring BW1 and the first additional bridge wiring ABW1,and the second bridge wiring BW2 and the second additional bridge wiringABW2, a reduced total resistance may be obtained.

Although FIG. 19 illustrates that the first thin film transistor 210belongs to the pixel PX1 and the second thin film transistor 220 belongsto the pixel PX2, the present disclosure is not limited thereto. Forexample, the cross-sectional view of FIG. 20 schematically illustratesportions of a display apparatus where the second thin film transistor220 as well as the first thin film transistor 210 belong to the pixelPX1. In other words, in the first thin film transistor 210 and thesecond thin film transistor 220 which belong to one pixel, that is, thepixel PX1, the first source electrode 215 a and the first drainelectrode 215 b of the first thin film transistor 210 are located on adifferent layer from the second source electrode 225 a and the seconddrain electrode 225 b of the second thin film transistor 220. In thiscase, the display apparatus according to the present embodiment furtherincludes the second interlayer insulating film 132 covering the firstsource electrode 215 a and the first drain electrode 215 b of the firstthin film transistor 210, and the second source electrode 225 a and thesecond drain electrode 225 b of the second thin film transistor 220 arelocated on the second interlayer insulating film 132. The pixel PX2 mayalso include thin film transistors having the same structure as thefirst thin film transistor 210 and the second thin film transistor 220belonging to the pixel PX1.

In this case, the first signal line S1, the first wiring W1, the firstadditional wiring AW1, the first bridge wiring BW1, the first additionalbridge wiring ABW1, the second signal line S2, the second wiring W2, thesecond additional wiring AW2, the second bridge wiring BW2, and thesecond additional bridge wiring ABW2 as illustrated in FIG. 19 may beidentically applied thereto.

Alternatively, as a modified example of the embodiment as illustrated inFIG. 20, the first bridge wiring BW1 and the second bridge wiring BW2include the same material as the first source electrode 215 a and thefirst drain electrode 215 b and are arranged on the same layer as thefirst source electrode 215 a and the first drain electrode 215 b, andthe first additional bridge wiring ABW1 and the second additional bridgewiring ABW2 include the same material as the second source electrode 225a and the second drain electrode 225 b and are arranged on the samelayer as the second source electrode 225 a and the second drainelectrode 225 b.

Although various embodiments are described above, the present disclosureis not limited thereto. In other words, it may be said that any displayapparatus having a substrate including the display area DA (see FIGS. 1to 3), in which the first part P1 (see FIGS. 1 to 3) of the edge has around shape, the peripheral area PA (FIGS. 1 to 3) outside the displayarea DA, and the pad area PADA (see FIGS. 1 to 3) inside the peripheralarea PA, a first wiring extending from the pad area PADA in thedirection toward the first part P1 and having a first discontinuouspoint where the first wiring is physically discontinuous, and a firstbridge wiring that allows the first wiring to be electrically continuousat the first discontinuous point, may belong to the technical scope ofthe present disclosure.

In this state, the display apparatus according to the present disclosuremay further include a second wiring extending from the pad area PADA inthe direction toward the first part P1 and having a second discontinuouspoint where the second wiring is physically discontinuous, and a secondbridge wiring that allows the second wiring to be electricallycontinuous at the second discontinuous point. The second bridge wiringmay be located farther from the pad area PADA than the first bridgewiring in the +y direction (see FIG. 3), and the second bridge wiringmay be closer to the edge E1 (see FIG. 1) of the substrate than thefirst bridge wiring.

In addition, in the above description, although the edge of the displayarea DA is described to have a rectangular or square shape as a wholewhile partially having a round shape, the present disclosure is notlimited thereto. For example, a display apparatus having a portion otherthan the first part P1 of the edge of the display area DA having a roundshape, belongs to the technical scope of the present disclosure. Forexample, the edge of the display area DA may be entirely circular oroval.

As described above, according to at least one embodiment of the displayapparatus, in the manufacturing process, the generation of a defect inpixels of the edge of the display area may be reduced.

While one or more embodiments of the inventive concept have beendescribed with reference to the figures, it will be understood by thoseof ordinary skill in the art that various changes in form and detailsmay be made therein without departing from the spirit and scope of theinventive concept.

What is claimed is:
 1. A display device comprising: a substratecomprising a display area and a peripheral area located outside thedisplay area, wherein a first part of an edge of the display area has acurved shape and the peripheral area includes a pad area; a first wiringcomprising a first one end located in the pad area and a first other endlocated in the peripheral area; a first additional wiring comprising afirst additional one end electrically connected to the first other endof the first wiring and a first additional other end located in theperipheral area; and a first bridge wiring comprising a first endelectrically connected to the first other end of the first wiring and asecond end electrically connected to the first additional one end of thefirst additional wiring.
 2. The display device of claim 1, wherein thefirst end of the first bridge wiring is closer to the display area thanthe second end of the first bridge wiring.
 3. The display device ofclaim 1, wherein a first bridge wiring comprises a first end physicallyconnected to the first other end of the first wiring and a second endphysically connected to the first additional one end of the firstadditional wiring.
 4. The display device of claim 1, further comprisinga first signal line extending toward an inside of the display area andhaving one end electrically connected to the first additional other end.5. The display device of claim 4, wherein the first wiring and the firstadditional wiring comprise a same material, and the first bridge wiringcomprises a same material as the first signal line.
 6. The displaydevice of claim 4, wherein the first bridge wiring is arranged on a samelayer as the first signal line.
 7. The display device of claim 6,wherein the first wiring and the first additional wiring are arranged ona same layer.
 8. The display device of claim 6, further comprising afirst additional bridge wiring located over the first bridge wiring andhaving both ends connected to the first bridge wiring.
 9. The displaydevice of claim 1, further comprising a thin film transistor located inthe display area and comprising a gate electrode, a source electrode,and a drain electrode, the source and drain electrodes being located onan interlayer insulating film covering the gate electrode, wherein thefirst wiring and the first additional wiring comprise a same material asthe gate electrode and are arranged on a same layer as the gateelectrode, and the first signal line comprises a same material as thesource electrode and the drain electrode and is arranged on a same layeras the source electrode and the drain electrode.
 10. The display deviceof claim 9, further comprising a first bridge wiring connecting thefirst other end of the first wiring and the first additional one end ofthe first additional wiring, wherein the first bridge wiring comprises asame material as the first signal line, and the first bridge wiring isarranged on a same layer as the first signal line.
 11. The displaydevice of claim 10, further comprising: a pixel electrode electricallyconnected to one of the source electrode and the drain electrode; and afirst additional bridge wiring having both ends connected to the firstbridge wiring, wherein the first additional bridge wiring comprises asame material as the pixel electrode, and the first additional bridgewiring is arranged on a same layer as the pixel electrode.
 12. Thedisplay device of claim 8, further comprising: a pixel electrodeelectrically connected to one of the source electrode and the drainelectrode; and a first additional bridge wiring connecting the firstother end of the first wiring and the first additional one end of thefirst additional wiring, the first additional bridge wiring comprising asame material as the pixel electrode, and the first additional bridgewiring arranged on a same layer as the pixel electrode.
 13. The displaydevice of claim 1, wherein the first other end of the first wiring iscloser to the display area than the first additional one end of thefirst additional wiring.
 14. The display device of claim 1, wherein thedisplay area comprises a first edge and a second edge facing each other,and a third edge and a fourth edge facing each other and being arrangedbetween the first edge and the second edge, the first part connectingthe first edge and the fourth edge, and the pad area is closer to thefourth edge among the first edge to the fourth edge.
 15. The displaydevice of claim 12, further comprising: a second wiring comprising asecond one end located in the pad area and a second other end located inthe peripheral area, and arranged closer to the first edge than thefirst wiring; a second additional wiring comprising a second additionalone end electrically connected to the second other end of the secondwiring and a second additional other end located in the peripheral area,and arranged closer to the first edge than the first additional wiring;and a second signal line having one end electrically connected to thesecond additional other end and extending toward the inside of thedisplay area.
 16. The display device of claim 15, wherein a shortestdistance from an imaginary straight line including the fourth edge to asecond position at which the second other end of the second wiring andthe second additional one end of the second additional wiring areconnected to each other is greater than a shortest distance from theimaginary straight line to a first position where the first other end ofthe first wiring and the first additional one end of the firstadditional wiring are connected to each other.
 17. The display device ofclaim 15, further comprising: a first bridge wiring connecting the firstother end of the first wiring and the first additional one end of thefirst additional wiring; and a second bridge wiring connecting thesecond other end of the second wiring and the second additional one endof the second additional wiring.
 18. The display device of claim 17,further comprising: a first thin film transistor located in the displayarea and comprising a first gate electrode, a first source electrode,and a first drain electrode; and a second thin film transistor locatedin the display area and comprising a second gate electrode, a secondsource electrode, and a second drain electrode, wherein the first gateelectrode and the second gate electrode are located on different layers,and the first source electrode, the first drain electrode, the secondsource electrode, and the second drain electrode are located on aninterlayer insulating film covering the first gate electrode and thesecond gate electrode, and wherein the first wiring and the firstadditional wiring comprise a same material as the first gate electrodeand are arranged on a same layer as the first gate electrode, and thesecond wiring and the second additional wiring comprise a same materialas the second gate electrode and are arranged on a same layer as thesecond gate electrode.
 19. The display device of claim 17, furthercomprising: a first thin film transistor located in the display area andcomprising a first gate electrode, a first source electrode, and a firstdrain electrode; and a second thin film transistor located in thedisplay area and comprising a second gate electrode, a second sourceelectrode, and a second drain electrode, wherein the first gateelectrode and the second gate electrode are located on different layers,and the first source electrode, the first drain electrode, the secondsource electrode, and the second drain electrode are located on aninterlayer insulating film covering the first gate electrode and thesecond gate electrode, and wherein the first wiring and the secondadditional wiring comprise a same material as the first gate electrodeand are arranged on a same layer as the first gate electrode, and thesecond wiring and the first additional wiring comprise a same materialas the second gate electrode and are arranged on a same layer as thesecond gate electrode.
 20. The display device of claim 17, furthercomprising: a first thin film transistor located in the display area andcomprising a first gate electrode, a first source electrode, and a firstdrain electrode; and a second thin film transistor located in thedisplay area and comprising a second gate electrode, a second sourceelectrode, and a second drain electrode, wherein the first sourceelectrode and the first drain electrode are located on a different layerfrom the second source electrode and the second drain electrode, andwherein the first signal line and the first bridge wiring comprise asame material as the first source electrode and the first drainelectrode, and are arranged on a same layer as the first sourceelectrode and the first drain electrode, and the second signal line andthe second bridge wiring comprise a same material as the second sourceelectrode and the second drain electrode, and are arranged on a samelayer as the second source electrode and the second drain electrode. 21.The display device of claim 17, further comprising: a first thin filmtransistor located in the display area and comprising a first gateelectrode, a first source electrode, and a first drain electrode; asecond thin film transistor located in the display area and comprising asecond gate electrode, a second source electrode, and a second drainelectrode; a first additional bridge wiring located over the firstbridge wiring and having both ends connected to the first bridge wiring;and a second additional bridge wiring located over the second bridgewiring and having both ends connected to the second bridge wiring,wherein the first source electrode and the first drain electrode arelocated on a different layer from the second source electrode and thesecond drain electrode, the first bridge wiring and the second bridgewiring comprise a same material as the first source electrode and thefirst drain electrode, and are arranged on a same layer as the firstsource electrode and the first drain electrode, and the first additionalbridge wiring and the second additional bridge wiring comprise a samematerial as the second source electrode and the second drain electrode,and are arranged on a same layer as the second source electrode and thesecond drain electrode.
 22. A display device comprising: a substratecomprising a display area and a peripheral area located outside thedisplay area, wherein a first part of an edge of the display area has acurved shape and the peripheral area includes a pad area; a first wiringextending in a direction toward the first part from the pad area, andhaving a first discontinuous point at which the first wiring isphysically discontinuous; and a first bridge wiring allowing the firstwiring to be electrically continuous at the first discontinuous point,the first bridge wiring comprising both ends connected to the firstwiring at both ends of the first discontinuous point; wherein theextending direction of both ends of the first bridge wiring crosses theextending direction of the first wiring.
 23. The display device of claim22, further comprising: a second wiring extending in a direction towardthe first part from the pad area and having a second discontinuous pointat which the second wiring is physically discontinuous; and a secondbridge wiring allowing the second wiring to be electrically continuousat the second discontinuous point; wherein the second bridge wiring islocated farther from the pad area than the first bridge wiring, and thesecond bridge wiring is located closer to an edge of the substrate thanthe first bridge wiring.
 24. A display device comprising: a substratecomprising a display area and a peripheral area located outside thedisplay area, wherein a first part of an edge of the display area has acurved shape and the peripheral area includes a pad area; a first wiringextending in a direction toward the first part from the pad area, andhaving a first discontinuous point at which the first wiring isphysically discontinuous; a second wiring extending in a directiontoward the first part from the pad area and having a seconddiscontinuous point at which the second wiring is physicallydiscontinuous; a first bridge wiring providing an electrical connectionto the first wiring at the first discontinuous point; and a secondbridge wiring providing an electrical connection to the first wiring atthe second discontinuous point; wherein the first bridge wiring islocated closer to the pad area than the second bridge wiring.
 25. Adisplay device comprising: a substrate comprising a display area and aperipheral area located outside the display area, wherein a first partof an edge of the display area has a curved shape and the peripheralarea includes a pad area; a first wiring comprising a first one endlocated in the pad area and a first other end located in the peripheralarea; a first additional wiring comprising a first additional one endelectrically connected to the first other end of the first wiring and afirst additional other end located in the peripheral area; and at leastone first insulating film disposed between the first bridge wiring and afirst wiring and between the first bridge and the first additionalwiring; wherein the first bridge wiring is connected to the first otherend of the first wiring and the one end of the first additional wiringthrough first contact holes formed in the at least one first insulatingfilms, respectively.
 26. The display device of claim 25, wherein thefirst bridge wiring comprises a first end connected to the first otherend of the first wiring through at least one contact hole among thefirst contact holes, and a second end connected to the first additionalone end of the first additional wiring through at least another contacthole among the first contact holes.
 27. The display device of claim 26,further comprising: a first additional bridge wiring located over thefirst bridge wiring; and at least one second insulating film disposedbetween the first bridge wiring and a first additional bridge wiring;wherein the first additional bridge wiring is connected to the firstbridge wiring through second contact holes formed in the at least onesecond insulating films.
 28. The display device of claim 27, wherein thefirst additional bridge wiring comprises a first end connected to theend of the first bridge wiring through at least one contact hole amongthe second contact holes, and a second end connected to the second endof the first bridge wiring through at least another contact hole amongthe second contact holes.